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Couple of things to check: Make sure you aren't dragging your fingers on the screen as you tap. If you do, then then digitizer sees that as a tap also and cannot resolve the screen. Also, if your friend used a screen protector, make sure nothing is under the edge of the screen pressing down. The digitizer actually goes under the frame of the display, so if there is a bit of paper, or screen protector, or whatever stuck under the frame, it is also seen as a tap.
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